When to apply for RRQ (Régie des rentes du Québec) benefits: earlier, age 65, or later?

Question

My 60 yr old spouse just retired on RREGOP. Should she wait until she's 65 to take RRQ (Régie des rentes du Québec), or even 70, or should she take it now, early, at 60?

I am semi retired myself. I do make a salary. Should I also take my RRQ now (62) and reinvest in RRSP, or wait until I'm 65 or even 70?

What factors should be considered in deciding whether to take RRQ earlier or later?

Thanks.