I suppose it’s about intentions, but as someone who always looked to settle down and find the person to live the rest of my life is, a big agegap can be pretty problematic later in life.
Like the obvious one: your partner dying while you’re still just middle aged.
Having to take care of an old person with old person needs as a 55-65 year old.
If they want children in a few years, OP could be 75 by the time the child moves out.
Again, it’s all about what the intentions are, but these things are worth considering.
People don’t have space for a home gym, so it’s either pay the membership fee, or don’t work out.