I know a [name_f]Constance[/name_f] (in her late teens, early 20s) so I think it’s totally wearable for a younger person! I also think she has a lot of nickname potential (Coco is excellent, [name_f]Connie[/name_f] is an option, [name_f]Tansy[/name_f] as others have said, [name_m]Ace[/name_m] if you’re feeling bold/stretchy) which I feel makes names more wearable because you can shift nicknames to suit the wearer without changing your full name.
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That said, if [name_f]Connie[/name_f] is a complete no-go for you, I’d advise against [name_f]Constance[/name_f]. In my experience, it’s not unusual for people with names that have obvious nicknames to start going by that when they get into their teens.
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Combo ideas:
[name_f]Constance[/name_f] [name_f]Paloma[/name_f] [name_f]Rose[/name_f]
[name_f]Constance[/name_f] [name_f]Bluebell[/name_f] [name_m]Ray[/name_m]
[name_f]Constance[/name_f] [name_f]Pamela[/name_f] [name_f]Rose[/name_f]
[name_f]Constance[/name_f] [name_f]Lillie[/name_f] [name_f]Rae[/name_f]
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I agree with @silver.magnolia that [name_f]Constance[/name_f] and [name_f]Florence[/name_f] in one combo is a bit too sing-song, but they go beautifully together. I love the idea of [name_f]Constance[/name_f] ‘Coco’ and [name_f]Florence[/name_f] ‘Ren’ as sisters 