I actually took that time from [1] which was set in 2017.

If you prefer, let's consider California, population 30 million to Scotland's 5 million. According to [2] for the "Boys 100 Meter Dash Varsity" 10.7 would put you among the 20 fastest in the state, although it wouldn't quite get you into the finals (which needed a time of 10.63)

Fastest 20 in a state of 30 million doesn't sound "pretty achievable for someone who spends time at the sport" to me.

[1] https://www.scotstats.net/records/outdoor-records/under-17/ [2] https://www.cifstate.org/sports/track_and_field/past_results...