You are 54 years old you plannin on having more kids? If not I would just blast and cruise if I were you. If you are dead set on coming off and running pct I would run HCG once or twice a week throughout the cycle.
.5 arimidex ED or EOD or E3D? If this is your first cycle don't automatically assume you need to take arimidex every day. Bodies handle estrogen differently. If you have good health care dialing in your estrogen is key to having a good cycle. Low estro will reak havoc on your joints and strength.