Yes but to be honest no one is going to play a sage who then turned into a barbarian, you have specifically picked a combination. That doesn't work thematically or mechanically on purpose just so you could try to say you are right.
And even then, you could easily pick 2 cantrips and a 1st level spell, that is useful for a barbarian.
Lets say:
Cantrips:
Mending
Prestidigitation
1st level spell:
find familiar
Reasoning:
mending to fix your equipment
Prestidigitation to help woth survival
(two tricks learned in a former life)
A familiar is always nice to have. For scouting around.
Neither of those spells is combat related, so no problems with rage, but bring quite some utility.
+2 con, +1 wis
Edit:
So you start with
Str 15
Dex 12
Con 16
Int 10
Wis 14
Cha 8
You were a sage that was rather wise than booknsmart. But even though you learned not that fast, you were able to work through a lot of nights to keep up. To help you concentrate and keep you awake, you used to work out a bit.
Even though you did not talk a lot to other people and were a bit awkward, you were quite adept at aquiring knowledge on travels by observing. On one such travel, your ship crashed and you had to get along in the wild. Your familiar helped you hunting. Making fire was also not a problem. You could mend a few items that helped you surviving. After a while, you learned how to live int the nature and And of defending against beast with your channeled strength. Eventually you bond with nature spirits. So you became a wildheart barbarian.
I bet at level 4 a nice feat like great weapon fighting or so will allow you to keep up with most other barbarians.
And in this way, sage is not only a tag you put on your character without actually picking skills or feats that fit, but also having stats and skills and a feat to match.
