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60+15 => 75, a pretty normal "lived a full life" age.

60+5 => 65, maybe dying before you even retire from your job.

Seems significant.

The difference between your grandkids meeting you or not.

Exactly - in my father's case would be difference between dying before all your kids marry vs meeting all your grandkids, helping to watch them.. and seeing them grow up and start going to school.

Plenty of people have kids in their 40s and 50s.