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The word 'era' means the period of a fixed number of years. Like Satyayuga, Tretayug, Dwaparuga, Kaliyug etc. In today we will describe the four eras. The age description implies that in this era, introduction of detail about the life, age, height, and incarnation of a person in that era. The proof of the age of each era and their detailed information is like this -

Satyayuga - this is the first era, the characteristics of this era are as follows -

The pilgrimage of Satya Yuga - Pushkar is.
In this age only the sin - 0 Vishva means (0%).
In this age, the quantity of virtue - 20 is universal (100%).
Avatar of this age - Fishery, Kuram, Varah, Nrusingh (all inhumane incarnations) is there.
The reason for the incarnation - the killing of Shankasur and the salvation of the Vedas, the defeat of the earth, the slaughter of the monsters, the execution of Hiranyakashipu and the pleasure of Prahlada.
The currency of this era - is gemstone.
The character of this era - is of gold.

The pilgrimage of Tretayuga - Naimisharanya.
In this age, the amount of sin - 5 is Vishwaa (25%).
In this age, the quantity of virtue - 15 Vishva means (75%).
The incarnation of this age - Vaman, Parasuram, Ram (the house of King Dasharath)
Because of incarnation - sent sacrifice to save the sacrifice, to destroy the Madandh Kshatriyas, to kill Ravan and slaughter the gods and free them.
The currency of this era - is golden.
The characters of this era - are silver.

'Dwaparug' - This is the third era, the characteristics of this era are as follows -

The shrine of Dwaparuug - Kurukshetra.
In this age the quantity of sin - 10 is universal (50%).
In this age, the quantity of virtue - 10 universes (50%) is there.
The incarnation of this age - Krishna, (from the womb of Devaki and the upbringing of the house of Nand), Buddha (Raja's house).
Because of incarnation - for the good of the Kansadi wicked people and the good of the people, to fascinate the demons.
The currency of this era - is silver.
The characters of this era - are of copper.

'Kaliyug' - This is the fourth era, the characteristics of this era are as follows:

The pilgrimage of Kaliyuga - Ganga is.
In this age, the amount of sin - 15 Vishva means (75%).
In this age, the quantity of virtue is - 5 universes (25%).
Avatar of this age - Kalki (Brahmin Vishnu's home of Yash).
Due to incarnation - for the protection of human race and the destruction of unrighteous people and for the protection of the people.
The currency of this era - is iron.
The character of this era - is of the soil.