Not specifically on self-poisoning hospitalizations in those age groups. But this is longer term data for completed suicides, for US teenagers: https://www.cdc.gov/mmwr/volumes/66/wr/figures/m6630qsf.gif

And since someone may well ask, the enormous difference by sex in those two charts is because the first chart I linked is hospitalizations related to self-poisoning. The above CDC chart is completed suicides. Girls tend to choose techniques that are generally less fatal, like poisoning. Boys tend to hang or shoot themselves, while the latter of those is very rare with girls. It's rather fascinating, and disturbing, how intensely localized these things can be, and how they're driven by social factors and what's culturally familiar.

Cry for help vs giving up.