We don't know. As someone mentioned earlier, 25 could be a relaunch with perhaps a status-quo change.
The arc title is ALL DIE YOUNG which can hint at various things:
- Someone might die young
- All of Cap's supporting cast, including Steve himself, have died or been presumed dead.
- Age - Steve's age is slowed and he looks remarkably young for someone almost 100. Bucky, too. Peggy was old, and now she's young. Sharon is older now, having lived the past few decades in an alternate dimension. Now she feels very age-disjointed from her contemporaries.