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Considering the context of the Friendship Games, which takes place in Equestria Girls, and the Shadowbolts' character traits, they're likely high school students, like Twilight and Sunset.

According to the general population of high school students in the US or Canada (based on the American system used by Crystal Prep), students in Grades 9-12 are typically around 14 - 18 years old.

Sort from most to least

Indigo zap: 17-18 years old (She might be the senior of the team because she looks like a leader and very confident.)
Sour sweet: 17 years old (Her behavior is that of a senior who likes to play with her juniors and has mood swings similar to a late teenager.)
Sugarcoat: 16-17 years old (She is very intelligent and outspoken, probably in her final year of high school.)
Sunny flare: 16 years old (Her personality is quite young and orderly, probably from the same year as Sugarcoat.)
Lemon zest: 15-16 years old (The most youthful personality in the group. She is cheerful and energetic. She may be the junior of the team.)

What do you think about it? Is there anything you want to say or put your opinion. Comment!❤️