If people think D’Antoni is too old to coach at 72 well Popovich is 74 and is still coaching.
D’Antoni has turned around a lot of franchises Suns in the 2000s leading them to 4 consecutive playoff appearances with 2 WCFs. He also lead the Rockets to 4 consecutive playoff appearances and was 1 win away from the Finals.
He hasn’t coached since getting fired from the Rockets in 2020 and it seems like no team is pursuing him as a coach anymore.
That would be up to San Antonio if they want to move on from him before he retires. Mike has had multiple gigs with multiple teams, where Pop has mostly just been the coach of the Spurs.