<｜begin▁of▁sentence｜>### Instruction:
Given a graph with vertices ['A', 'B', 'C', 'D', 'E', 'F'] and respective ages [25, 32, 45, 23, 54, 36], how can you use VertexSeq and its methods to select vertices older than 30 and find a specific vertex by its name?
### Response:
import igraph as ig

# Create a simple graph
g = ig.Graph(edges=[(0, 1), (1, 2), (2, 3), (3, 4), (4, 5)])
g.vs['name'] = ['A', 'B', 'C', 'D', 'E', 'F']
g.vs['age'] = [25, 32, 45, 23, 54, 36]

# Select vertices with age greater than 30
older_vertices = g.vs.select(age_gt=30)

# Print the names of these vertices
print('Older vertices:', older_vertices['name'])

# Find a vertex with the name 'C'
c_vertex = g.vs.find(name_eq='C')
print('Vertex with name C:', c_vertex.index)
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