"When a plot or backstory features a Time Skip, it seems that male characters age and either become Mentors, Badass Grandpas or Old Masters, while female characters are written out of it altogether in various ways.
This trope is a Double Standard for specific works where female characters either remain eternally young and beautiful or are written out while the guys are just Older and Wiser and still around in some way. It goes hand-in-hand with Men Are Strong, Women Are Pretty, since she either stays pretty, or she's out."
* Heroes like Captain America and the Winter Soldier are still around from the World War II era, but have been preserved by cryo-stasis. No female character from the same era is still active, with the aged Peggy Carter being replaced by her niece, Agent 13.
* Hank Pym is retired, but actively training his successor. Janet Pym, however, has died and her young daughter, Hope, wants to replace her.
* In the X-Men film series, the only female character from the X-Men: First Class era that returns is the immortal Shape Shifter, Mystique. Other female characters, like Angel Salvadore and Emma Frost, are never seen again. Both are said to have died in X-Men: Days of Future Past. (???)