There is no magic age for shingles. Risk increases with age, but there isn't some sharp knee. Here's some data.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4636742/
To break that down, annually -
0.86 for those aged ≤19
4.47 per 1000 person overall
8.46 among adults ≥50 years
10.46 among those aged ≥60 years
12.78 for patients ≥80 years
A link there gives more detail:
So 50's is ~ 2.6x more likely than those under 50.
In your 60's ~ 3.3x ~ 4.1x ( they broke that down into 5 year groups) more likely than those under 50.
In your 70's ~ 4.8x more likely than those under 50.
It certainly increases with age, but it's not like it would be rare for those under 50 to get it compared to someone in their 60's 70's.
-ERD50