I notice 38 year old Greta Arn is making another comeback, having retired for four years then started playing again for the last few months. She's managed to reach the QF here.
Along with Patty Schnyder, and Venus, amongst others, for age, and the likes of Sevastova for injury, the evidence continues to accumulate in overturning the old notions about the duration and nature of a tennis career. They may, in time, become not only much longer, but also regularly include a break of several years.
Although, nice enough though Greta is, I would dearly love for it to be a different Hungarian resuming her career: Agnes Szavay. Her loss to injury robbed the game of a wonderfully stylish player. She's still only 28, so maybe there's still hope.
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Data I post, opinions I offer, 'facts' I assert, are almost certainly all stupidly wrong.