Age Duration
Age 20-30 Preventative: every 6-8 weeks
Age 30-35
Initial series of 4-6: (1x per week)

Maintenance: every 6-8 weeks

Age 35-40
Initial series of 6-10: (2x per week)

Maintenance: every 6-8 weeks

Age 40-50
Initial series of 8-12: (3x per week for 1 week; 2x per week thereafter)

Maintenance: every 4-8 weeks

Age 50-60
Initial series of 12-15: (3x per week for 2 weeks; 2x per week thereafter)

Maintenance: every 3-6 weeks

Age 60+
Initial series of 15: (3x per week)

Maintenance: every 3 weeks