age = 18

match age:

    case x if x < 10:

        print(f'< 10 years old: {x}')

    case x if x==10:

        print('10 years old.')

    case 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18:

        print('11~18 years old.')

    case 19:

        print('19 years old.')

    case _:

        print('not sure.')