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for (Person p : persons) {
    p.setAge(p.getAge() + 1);
}

persons.stream().forEach(p -> p.setAge(p.getAge() + 1));

for (Person p : persons) {
    if (p.getAge() < 18 && p.getGender() == 'M')
        p.setAge(p.getAge() + 1);
}

persons.stream()
	.filter(p -> p.getAge() < 18 && p.getGender() == 'M')
	.forEach(p -> p.setAge(p.getAge() + 1));