Birthday is the day for enhancement of the ability of an embodied soul to imbibe chaitanya, through the benevolent frequencies gained by invoking Deities. Through this action which raises the sattva component in the atmosphere, the embodied soul achieves stability of the inner mind
In this website it is said that
A. Birthday of a person in Satyayug
In Satyayug, Tretayug (note) and Dwaparyug (Third in the cycle of the
four eras), spiritually evolved individuals were either invited to
bless the person on his first birthday, or the child would be taken to
such individuals for their blessings. The evolved individual would
perform aukshan (Ritual of waving a lit lamp in front of the
individual) of the child and, making an unexpressed resolve, would
shower akshata (Unbroken rice grains smeared with saffron and used in
ritualistic worship) on various parts of the child's body, thus
activating the chakras in those areas.
B. Birthday of a person in Tretayug and Dwaparyug Saints would assess
the spiritual progress of a person during the year and then bless
In Tretayug and Dwaparyug, several spiritually evolved individuals would visit a person and would bless it for rapid
spiritual progress or the person would visit Saints to seek their
blessings. After receiving blessings from the spiritually evolved, the
individual would make sincere efforts towards spiritual progress. On
the subsequent birthday, when the individual would go to seek the
blessings of a Saint, He would evaluate the spiritual progress made by
the person during the year and only then bless him.
- Importance of celebrating the birthday as per the tithi A. Blessings and good wishes bestow maximum benefit
Our vibrations match the tithi of our birth most. As a result, the blessings and good wishes of relatives and well-wishers
are most effective on that tithi. Hence, the birthday should be
celebrated as per the tithi.
In according to Malayali Hindu families, birthday's are not celebrated using English calendar days, instead they celebrate it using birth star or
which differ from year to year, and as you have said that 60th birthday (Shashti Poorthi) is celebrated very grandly and is usually celebrated of a male, in which it is considered that he has completed his half of his life as of 120 years of estimated normal Human life, in the same way 70th is also celebrated which is termed as
Sapthathi which is not celebrated that grandly as the 60th one.
According to traditional Vedic astrology it is advised that the birthday should be celebrated as per the Hindu lunar calendar. Astrology birthday as per Hindu calendar is 'tithi' based. According to wikipedia - In vedic timekeeping, a Tithi (also spelled thithi) is a lunar day, or the time it takes for the longitudinal angle between the moon and the sun to increase by 12. Tithis begin at varying times of day and vary in duration from approximately 19 to approximately 26 hours. There are 30 tithis in each lunar month.
According to this article it is given as:
Significance of each day in Vedic Astrology Birthday Predictions.
- Sunday Such individuals are very talkative and love facing challenges.
- Monday- Honesty is a virtue they possess and are people with strong conviction.
- Tuesday-Generally hot headed yet progressive, they are a bundle of energy.
- Wednesday-These are people with high level of intelligence and great looks.
- Thursday-Excellent time managers, they are generally calm and composed.
- Friday-People who see the practical side of things and love the colour white.
- Saturday-Generally thin and sensitive in nature.