While in any other field...Who want's their house designed by the youngest, freshly graduated Architect? Who wants to be operated by a Surgeon on it's 2nd heart operation? Who wants the Junior Partner Lawyer supporting them on their court attendance?
What would the Abel prize winners think? https://abelprize.no/winners
A young software dev is hired by a young team lead hired by a young founder. They probably have biases. And code is code and code can be changed easy unlike your heart or built house. So people think! I am generalising though!
Who wants the old man mechanic?
[1]. "The Importance of Hiring a Good Mechanic" - https://www.postonmotorcompany.com/hiring-a-good-mechanic
Or, more properly, I want the most experienced professional (for anything) that I can find and afford. Age is a rough proxy for that, but it isn't ironclad.
I'd prefer the 60 year old who has been working on cars since they were 20 over the 30 year old who started at the same age. But I'd also prefer the 30 year old who has been working on cars since they were 20 over the 60 year old who started at 55.