Anyways, Khushi (read happy) hoon... this is not related to khushi (read the bachchi)😆...
On a serious note, I think this is mentality issues than age...
if at all Rangu is older than Anji, still he would have understood her very nicely...
If at all, Ashu & Nidhi were same age, still they would have had conflicts in Mallika issue or money spending issue...😆