If else if in Grrovy

int age = 105;

if (age < 20)
{
    if (age >=0 && age < 6)
    {
        return "small baby";
    }
    else if (age >=6 && age < 18)
    {
        return "go to school";
    }
    else if (age >=18)
    {
        return "go to SVO";
    }
}
else if (age > 60 && age < 100)
{
    return "retirement";
}
else
    return "too old";