How often can a man fall in-love in a normal lifetime.

Assuming that a man committed to one woman in his early 20(s.) got married had kids and all that good stuff. ( no more falling in love for you dude) that was meant to be it!
Is it likely that Love  will happen for him again  , will he never fall in-love again... with another woman? If we assume that he will make a new start at some point during his more mature years. what will the difference be..... between how he felt in his early years and how he would feel in his more mature years.
in the mature  years lyrics like these  will be very likely  applicable:

Started out good .We started out so good. To end up so bad Where did we go wrong
What happened to the love we once had It’s slowly slipping away I feel it slowly slipping away How can we let it end This love was so right. From the beginning How can love so right be so wrong now How can love so right be so wrong now

Could light up a room

Thinking of yesterday

When love was in full bloom

The fires from our love

But somewhere along the way 
We made a jagged turn 
The plans we both had They’re beginning to burn.   
How can love so right be so wrong now
 How can love so right be so wrong now 
 How can a love so good turn out so bad 
Tell me what happened to the love we once had 
Too bad, so sad, too bad, whoa, how 
 How can love so right be so wrong now 
 One day your love is glad 
The next day you end up sad 
Ooh, babe, what a thin line It’s enough to drive you mad 
 One day our love was good and hot 
Next day running cold 
One day we had a new love 
But now it’s old ( happened pretty fast)

In a man's more mature years. (maybe the second time around at finding Love, he wants to go the distance with that person ........

he find himself questioning everything. If what he experienced in the early years was real.  
Because unconditional Love, it wasn't, for sure. 

Conditions got set and set somewhere along the way. security, became insecurities, comfort, 
became uncomfortable situations.....then fears became, nightmares.... 
as a mature man we remember all that went wrong.  

Apprehension becomes the new Normal.. 
We just don't want to make another mistake, feel like we can't afford another........... blunder. 
Because in Our Mature years we just don't recover from these types of mayor set backs quickly. 
Starting all over again becomes a mind set of let it all go and don't bother,
because you have concluded that it's too late to be like this smiling couple (above) anymore.