Check with Alveus if we have (estimated) ages for the marmosets

[pjeweb]

I think we know estimated ages for the marms, so we could add those?

Maybe we can add something to show estimated ages in general. We might have those for other ambassadors?!

[MattIPv4]

The UI should handle approximate ages of just a year or year/month are provided iirc -- the typings certainly allow for it