Something my friend was asked that is quite fun:

Name your best XI that uses players since you have been born but you're only allowed one player from each club and each country.

So for example, you couldn't have Ronaldo and Schmeichel because both have played for Man Utd despite not playing at the same time.

His was:

GK - Chilavert

CD - Van Dijk
CD - Kompany
CD - Maldini

DM (or SW) - Mattheus

CM - Gascoigne
CM - Valderrama

AM - Zico

F - Messi
F - C. Ronaldo
F - Mbappe

I'm still thinking but lets see what we can all come up with.