Age of the stand – in classes of 20 years. Reference: Field Survey (MID 264: Bestandesalter)

Code	Text	NFI1	NFI2	NFI3	NFI4	NFI4b	NFI5
-1	n/a	x	x	x	x	x	x
1	0 (unstocked)	x	x	x	x	x	x
2	1-20 years	x	x	x	x	x	x
3	21-40 years	x	x	x	x	x	x
4	41-60 years	x	x	x	x	x	x
5	61-80 years	x	x	x	x	x	x
6	81-100 years	x	x	x	x	x	x
7	101-120 years	x	x	x	x	x	x
8	121-140 years	x	x	x	x	x	x
9	141-160 years	x	x	x	x	x	x
10	161-180 years	x	x	x	x	x	x
11	>180 years	x	x	x	x	x	x
12	uneven-aged	x	x	x	x	x	x