For us, thinking about it had a lot of inputs:
1) I wanted us both to have 35 years of earnings on record with Social Security. That would make age 51 the earliest.
2) My pension required me to be at least 50 to start drawing on it.
3) We only get employer-paid medical coverage in retirement if I retire. So had to work until age 50 at a minimum.
4) We have been taking lavish anniversary trips of 7-11 days each year since 2006. That allows us to feel we're "living".
5) I worked a 9/80 schedule pre-Covid, and now work from home at least 2 days per week. That really helps with work/life balance.
6) We want a large income in retirement - to help family, and to take some bucket-list trips. Also, that large income will afford us the means to live in CA in retirement, which is really important to us, especially given recent political trends.
All in, we decided retiring at ages 60/62 would be our sweet spot. If I cam forcibly laid off, or medically separated between age 50 to age 60, we'd have to adapt a bit. But 60 means a ridiculously indulgent retirement income.
So I feel like we have a LOT of work/life balance, we have a great income, we save heavily, we travel enough for now - it's a pretty good gig. Any chance you and your partner can find something similar?