Dear Mickey, When Saturn is placed in Capricorn, Aquarius, or Libra and in one of the Kendra houses that is 1st, 4th, 7th or 10th house from ascendant in anyones horscope then Sasa Yoga is formed. So this pattern although less but can be in many people horoscope. Since you have your Saturn placed in 4th house (Kendra) and in Aquarius sign, you have the Sasha Yoga, in the Navamsha too Saturn is in 4th house and aquarius sign making your sasha yoga gain strength. Being retrograde amplifies the strength of Saturn but delays Sasha yoga manifestation in life. Sasha Yoga is already existing in your life which will bring qualities of Saturn at its best like patience, connecting with masses and people at all levels, emotional stability, giving you an internal authority over things etc. Saturn usually matures at age 36 and activates or gives good results in its yoga and ruling houses. Since your Saturn is also in a Rahu nakshtra and retrograde, you may find growth due to this yoga or realize its potential between age 36-42. If you are aligned to career and work related areas which are Saturn governed, you will make most use of this yoga, like doing technical work or being in politics or working closely with government authorities and initiatives. Even if you are in corporate, you will gain authority like being in governing position. Hope this clarifies your questions.
Sasa Yoga is established when Saturn is positioned in Capricorn, Aquarius, or Libra and in one of the Kendra houses, which is the first, fourth, seventh, or tenth house from the ascendant. Saturn is exalted in the zodiac sign of Libra and is the lord of the Capricorn and Aquarius signs. The power of yoga will be influenced by Saturn's power as well as by other planets' influences over Saturn. If Saturn is between 5 and 25 degrees and not aspected or in conjunction with the malefic planets like Mars, the yoga has a very strong effect on the indigenous' lives.