I retrained when only a few years younger than you.
(I could say that I have been running away from my vocation for the last 20 years....)
Finding a first job is ferociously competitive. I was REALLY lucky and found one through personal recommendation, though it is quite a challenging school and I commute a LONG way. I teach not quite full time, which makes it marginally more family-friendly, and I have a head who doesn't care what time we arrive or leave as long as the work gets done. I choose to work at home late in the evening (so I leave school promptly, pick up children, do lots of mum-taxi stuff, cook and eat supper and then work), while another member of staff never takes work home but is at school till late every evening. Other heads may encourage more 'presenteeism', it's an individual school culture thing. Obviously staff meeting night is a late one, and teachers in many schools are expected to run after-school clubs.
Think carefully about how you will manage while you train. Again, I was lucky enough to live within striking distance of one of the few places to offer a part-time Primary PGCE. A full-time PGCE is hard work and long hours. GTP and SCITT places are like gold-dust and for GTP in particular you need extensive previous experience in a school.
It depends on why you want to re-train. If you cannot imagine any other job, are prepared for hard work (it's no harder work or longer hours than e.g. a management job in a company which is what I did before - but it is 'lumpier' and takes over your life to a greater extent!), have good flexible childcare arrangements and there seem to be a realistic number of local teaching vacancies, go for it!