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yeah, it use います (my mistake).What textbook are you using? Doesn't it say 店に客が三人います?
can I write '二枚パンツを買います' ?年が上(だ) means "older" as a set, i.e., 3つ modifies the entire clause 年が上, not just 年. You can't use の after the counter in these cases, as in 3センチ背が高い, 3キロ体重が重い or 3坪面積が広い.
FYI, 店に3人客がいます is also correct.