I used to play with my grandma Rummikub. However, they had an old game, where the stones were much smaller and still made of cardboard and thus the color has faded quite over time. I myself have a game in which the stones are large and made of plastic, however, lie flat on the board. As can my grandma (now 84 years old) the stones are no longer effective and with it lose the desire to play. Birthday I now have given her this version and it has again much joy in playing.
The only negative factor is that seniors have in the age difficulty (especially in winter, when you can no longer play in daylight) the colors to keep them apart.
Otherwise a really great game, well thought out and also to play with small children well, since these can attack the stones better, nor by upside-down figures are confused.