How Old Is Old

[roo boys!]

Yep, both would be a huge Loss to them when they go.

[bunyip]

Both at the same time, yes. But one or two seasons between gives you a chance to replace them. If Milburn and Scarlett both retired it would be very hard to recover. But say Milburn next year and Scarlett in a couple of years gives you a chance to groom someone.
Geelong lost Harley last year and it hasn't caused any problems, and he was an important player defensively.