People change over time, mature, grow, have different priorities in life as they age. So yes it’s possible to realize that the person isn’t really who you thought they were.

Not only people change but also young people often as you said yourself “blinded by love” and just don’t see beyond that. Sure many young people marry in their 2Os but statistically speaking young marriages are less likely to survive.

In your situation age is not relevant though. What’s relevant is that you don’t share fundamental values with this man and aren’t sure he is right match.