In dating terms, this refers to a man old enough to be a woman's father.
Usually a man more than 15 years older than a woman is considered to be an older man.
Also closely related to the definition of a sugar daddy. A sugar daddy is an older man but an older man need not be a sugar daddy.
Actress Catherine Zeta Jones husband Michael Douglas is an older man.

Sonia told me that she would love to marry a rich older man.
by hottie27 August 14, 2008
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Fancy going bald-digging later?

My friend's dating an older man; she's such a bald digger
by Oldmanlover November 1, 2013
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