I'm not sure if there's a 'supposed' to age. I think because it's not a developmental something that leads to something else really? Like sitting leads to crawling leads to cruising leads to walking. But somersaulting leads to...handstands? That's just my guess - for all I know it could be a milestone of some sort - but Riv's just learned to at almost 3, so I'd say not, since from 16months to 3 years is a big span!

Clever Pip though! Has he figured out the head tuck? Sometimes Riv forgets and the whole stunt falls sideways, pretty funny.