So, even if he starts out being 15 ( he is shown as much older), by the time the first 20 year leap, he should in the least be somewhere in his 40's, but the way they show his arguments and fights with Prem, they treat them as in almost same age group.
Biggest of the blooper came in Bandini, with the last 18 or 16 years leap. They show shashank coming to a party with his grown up sons, hard core business men. Whereas, Kaddu was not even pregnant at the time before.
Even if she was, her kids would be teenagers and not grown up men.
Not just EKTA Serials, other serials also have the issue of bloopers.
Main being in Geet, at the beginning of the show, we have DEV with his family, a mom and sister, who completely disappeared of the show. Then, Dadi mentions they were 3 brothers, one of whom never came at all.
Out of the blue, the brother changed sex to become a sister.
I hope the production houses when they change Creatives or WRITER would get someone with enough sense to at least keep track of the basic plot or characters.