Its not a matter of age so much as a matter of size and ability. If the bike fits you go for it no matter what your age is.
when you sit on the bike, you should be able to touch the ground with your toes.
You should be able to ride a 100-150.
cbr 150
You would probably need a 250. But, choose a 4 stroke to start with unless your pretty familiar with a dirtbike, in which case you could get a 2 stroke.
honda
150
The cost to replace the alternator in a Honda Odyssey will depend on where it is purchased and installed. The average cost of an alternator is between $100 and $150.
My 1965 Honda 150 Benly or mini dream says on the engine below 15 c use 10w20 and above 15 use 10w30. The oil should be a straight weight. I would go to a Honda dealer since their oils actually have additives for the clutch performance.
150$
the Honda 150rd of couse but if you want a trail get a Honda 150f.
140kph
ph.150 ooo