You are an inspiration.Keep it up. Have a mate and he`s 75, sails all time with us He goes out in rough ;smooth windy or light.He`s normally done a round of golf AM and sails PM !!!(I`m 54 and like Nakaniko have displaced disc C5/6 !!! snap !!!)
Anyhow; I reckon a big Go would be ideal.Not sure about wind in Philipines but reckon PG`s advice of starting with a 6 is a good start.
Philipines sounds just like our east coast;apart from we have dirty brown water;muddy beaches; grey skies ; oh and lots of rain. Apart from that identical. (stilllove sailing there tho !!)
Serenity is difficult to sail but great in light winds.