I can't tell you how long your skis should be just based on your height. Type of skis and skill level can greatly affect how long your skis should be. If you are a beginner your skis should between your chin and nose. If you are intermediate your skis should be between your nose and eyes. If you are an expert the ski should be above your eyes but no longer than your height. If you are buying twin tips you should add around 5cm to the length of the skis, thus being one of the exceptions to the 'never above your head rule'. The only other one is if you are a high level racer. Your best bet on getting a good length ski is to be fitted at your local ski shop.
PL 52 = USA 22
Some RVs use this size.
It depends on the 52 year old person....size....sex.....activity level...etc.
European size 52 is equivelent to 42 UK see the link below.
probably a Large i.e. 50 or XL i.e. 52. The 52 will be big but will have room to wear shirt or sweatshirt underneath.
42
52
Lyman
52 cm
52
The formal name is pentacontakaidigon. Most people, including mathematicians, will use 52-gon since that effectively communicates the size of the polygon. But, if you want to appear pretentious or be obfuscatory, by all means use the Greek prefices.
Use whatever type of oil the user manual specifies.