"He's an IT team leader. ... I'll never earn as much as him (13 year age gap)."
Don't write yourself off BlackMaryJanes. If earning as much as him is truly his heart's desire (and yours), then you can do it, provided you pick a sufficiently well-paid area to go into (IT is a good one). But it will require some sacrifices on his part and yours...
DP is 7 years older than me, so not quite such an age gap but when we first started our relationship about 14 years ago he had a professional role and I didn't - earned about 50% more than me. I studied part-time, we moved a couple of times so I could follow better roles (the first move was necessary, the second I could probably have found something closer if I'd given it a bit longer). Now I earn slightly more than him (on mat leave at the moment) and his salary has gone up in the meantime (by about 50% again). (We're both on around 40K at the moment. Could be on more if we both went for management roles but have chosen not to at the moment, hoping to both go part-time after mat leave.) We didn't have kids then, so have upped the hours below (but I really didn't do any housework at all when I was working full-time and studying part-time - my supper arrived under my nose when I was studying in the evenings and DP did absolutely everything else housework-wise, while working full-time in a reasonably senior job. Actually, your DH's job, as it happens.)
So, if he's willing to do the following:
- No more late nights at work for him. In fact, he needs to expect to give up 100% of his evenings while you're training/getting your foot on the ladder. And probably a few weekends too, for big study/work deadlines.
How many lates does he do currently? I'm guessing in a team lead role he does a few. Plus if he's still technical he'll probably expect to spend a few hours at the weekend geeking about keeping up with new tech. That will need to go, he might get a little bit of weekend time just to keep his hand in but should expect it to drop significantly - your time now.
- Next few career moves - those are YOURS. Not his. He needs to fit around your needs, if he wants you to be able to catch up career-wise. But that's okay, you'll be working really hard and he'll have had the stress of being sole earner taken off him.
(Of course this is ignoring the 13 years of retirement time he'll be spending relaxing while you're working your socks off to keep him in luxuries.) But it's do-able, if that's really what he wants, and not just a convenient thing to grumble about when he's had a crappy week. Or, as suggested, you could both go for something in between the extremes.
Tell you what, why doesn't he try it out now to see how it feels? If he spends the next fortnight or so doing 100% of the evenings (might take a little while for him to get up to speed if you've been doing it all), and at least 2 weekends where you get a good 6 hours a day free time (and don't have to do extra to pick up laundry/cleaning afterwards!), that will give him a taster of what it might be like if you're going absolutely hell-for-leather career-wise. (You can spend the time researching possibilities, though I'd recommend you spend at least some of that time brushing up on an old skill/starting to learn a new one.)
Then you both have an useful benchmark and can work back from there to something a bit more moderate that will work for you. (Or you might decide you love it!)