Going back to do a Postdoc at 35?

I am currently a postdoc in the UK. My situation is similar to yours: in my thirties, have a family and little children. This is my first postdoc, which I took in my thirties. I also wish to pursue a career in academia. But unlike yours, I have no industrial experience and I am not from the EU. Cost wise, if you and your family are non-EU nationals, you will need to pay a lot more so that your family can stay in the UK with you. Still, regardless of your nationality, it can be a bit hard to support the family if you are the sole breadwinner, but it is not impossible.

Do you intend to continue living in the UK, or are you open to moving to another country at the end of your postdoc? Your experience of living in different countries plus your industrial experience are an advantage should you find that there are no suitable academic opportunities in the UK after your postdoc.

What I would think is more important is to have an understanding and support from your wife. As a postdoc, you might have more freedom and flexibility over how you manage your time at work, but the pressure to publish may be high. It is important to know your limitations now that you have a family. It is likewise important for your wife to know what to expect. Having said this, considering you experienced Japanese working culture, what I have just said might not be a problem for you.

All in all, it looks to me that there is nothing for you to worry about going back to do a postdoc in the UK at 35, at least not from the technical aspects above. The deciding factors could be something more practical or personal, but it could be that I have said this from my own limited perspective.

For guys with PhD who pursuing academic career the age they should worry about is their 'PhD' age (number of years since PhD graduation), not their biological age. So, in your particular case the real problem is not starting first (it would be first, right?) postdoc at 35 but starting the first postdoc when you are already 10 years PhD old. To put simply, the concern (that many of your potential academic peers would have when evaluating your job applications, funding proposals, etc.) is as follows: why did this guy move back to academia in 10 years after obtaining his PhD? In essence (as I see it), if you know the legit answer to that in your mind and heart (and, you hope, that this answer has at least some sense to the others in academia :) then go for postdoc.

Speaking more practically, while considering a postdoc option it is a good idea to do the following:

• Talk with your PhD supervisor (and expected postdoc boss; btw, while it depends doing postdoc at the same place where you did PhD is not great career-wise) about your career in academia. I.e. in his/her opinion, what are your perspectives after finishing a postdoc period with him? Ideally, there should be some 'career development' plan for your postdoc period prepared before your start date: i.e., participate in these projects, publish that many publications, apply at this number of funding opportunities, contribute to that many ongoing/expected research proposals, apply to that many UK lecturer (or elsewhere) long-term positions, etc.
• You are PhD with a significant industrial experience. Typically, academia-wise, it is not that interesting since academia is all about publications and, much more importantly, funding. However, in your particular case (and in your particular area and within your research directions) it might be somewhat different. E.g. will you have good chances to bring more funding to your/your research group because of your industry understanding and experience, contacts, etc? Will you be able to come up with feasible collaborative projects, etc? The point here is that just another postdoc (doing research, publishing papers, ...) is not that interesting to anyone as there are plenty of those and most of them are expectedly 'better' than you (younger, with no interruptions and hence more on the research edge, etc). At the same time, a postdoc who can bring value (in terms of collaborations, funding from companies, etc.) based on his industrial experience is much more interesting (and, in fact, rather rare).