"Ki orech yamim ushnos chaim v'shalom yosifu lach" - "For length of days and years of life and peace shall they add to you." From here the Mishnah goes on to list a series of qualities and traits:
Beauty
Strength
Wealth
Honor
Wisdom
Old age - a more advanced age.
Children
All of these are essentially more physical qualities, and even so the Mishnah states that they are fitting for the righteous: when these gifts, talents and traits are in the hands of the righteous, it is a good thing for the entire world.
What all these qualities have in common:
Each one of these qualities carries within it the possibility of being misused, and at the very same time the possibility of being used for good. Therefore, when they are found in the hands of the righteous, it is a very good thing for the world, because they will use them for good.
The verses the Mishnah brings:
"Ateres tiferes seivah bederech tzedakah timatzei" - old age is considered a positive quality in the righteous; great is the splendor of an elder who has lived a full life of Torah.
"Ateres chachamim ashram" - the wealth of the wise is a crown for them.
"Ateres zekeinim bnei banim v'tiferes banim avosam" - the crown of the elders is their children and grandchildren, and the glory of children is their fathers.
"Tiferes bachurim kocham vahadar zekeinim seivah" - the verse praises the quality of strength in young men, and old age in the elderly.
"V'chafrah halevanah uvoshah hachamah ki malach Hashem Tzevakos b'Har Tzion u'viYerushalayim" - this verse speaks of the time when Mashiach will come, and it concludes: "v'neged zekeinav kavod" - those elders who have a connection with Hashem, that is honor.
The Mishnah adds: these seven qualities, which were listed with regard to the righteous and which are good when found in their hands, were all fulfilled in Rabbi Yehudah HaNasi and in his sons. Rabbi Yehudah HaNasi was extraordinarily wealthy, and he possessed all the other virtues as well - as stated by Rabbi Shimon ben Elazar.
In summary: this Mishnah lists seven qualities - beauty, strength, wealth, honor, wisdom, old age and children - which, although they are physical in nature, can be used for good, and therefore they are fitting for the righteous and good for the world. The Mishnah brought a series of verses to establish this, and concluded that all seven qualities were fulfilled in Rabbi Yehudah HaNasi and in his sons.
In the next section we will discuss Mishnah 10.