Rob Lowe In His Grandpa’s Tank Top Undershirt (Instagram)

Yesterday, for #ThrowBackThursday on Instagram, Rob Lowe shared a photo of a much younger self wearing his Grandfather’s ribbed tank top undershirt.

Got to hand it to him though, at 50 years old, Rob Lowe is looking pretty excellent. (Jealous? Yep.)

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#ThrowbackThursday In my Grandpa's undershirt.

A post shared by Rob Lowe (@roblowe) on Jan 22, 2015 at 2:11pm PST