I'm 78 kg - 5'4", and, I'm 53 years old - I had never surfed in my life, and got my first stand up board exactly 1 year ago. It was a C4 waterman 10'6" inflatable. Now, I have a 9'6" Coreban Performer, a Naish Hokua 9'5" and a 9'3" - I have grown out of the bigger C4 board, and already thinking in a few more months I will want a smaller board. I got my first board intending to only paddle flat water, no intention of ever going near a wave - now I go check the surf every 20 minutes and can't wait to get out there. If you start, you will be hooked, and if you put even a minimum of time in you will out grow a 10' Mana very quickly. If you have any surf back ground you will out grow a 10 ' Mana very quickly. Sure, a board you hardly ever fall off when starting might be a good idea, but for me, part of the benefits of falling off constantly was it got me fit fast, just getting back on the board over and over. Sorry I can't recommend a board, as I only know what I like, but I just think you could start on a smaller board. Oddly enough, I still consider getting a Mana or a Nalu - I look at the brochure every day, and absolutely love their boards, but for sure there are other great boards out there, and there must be paddlers your size who will let you know what is suitable. Nothing crazy, but I think a little smaller, or at least less volume.