Yes. Under Main Sequence lifespan on page 20 it says:Apologies if this has been covered before: for star age calculations are subdwarf (Class VI) stars treated the same as main sequence stars? Thanks in advance!
the ‘normal’ phase of a star’s life is similarly determined for Class Ia, Ib, II, V and VI stars.
The 'lower half' of subdwarfs is all under 0.9 Sol, so their actual age can be determined by the Small Star Age equations on p. 21, and those odd duck hot O and B subdwarfs (as well as all Class Ia, Ib, and II) would use the Large Star Age equations on the same page.
I'll have to be honest and say that I don't know what those odd duck hot subdwarfs evolve into, but the G-M subdwarfs, if the universe where older, would go through a VI -> IV -> III -> White Dwarf life cycle, similar to the main sequence stars.